Concrete truss girder-bridge



J. V. JENKINS & E. l. CREIGHTON.

CONCRETE TRUSS GIRDER BRIDGE.

APPLICATION msn Auazz, |913.

3,195,820, hmm Aug, 22, 1916.

S TENT JOI-IN V. JENKINS AND EDWARD J. CREIGHTON, 0F DENVER., COLORADO.

CONCRETE TRUSS GIRDER-BRIDGE.

Application led August 22, 1913.

To all fr0/tom if may concern.'

Be it known that we, JOHN V. JENKINS and EDWARD J. CuniGH'roN, citizensof the United States, residing at the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Concrete Truss Girder-Bridges, of which the following is a specilication.

Our invention relates to an improvement in concrete truss girder bridges, and the object is to provide an economic bridge which can be constructed by placing the reinforcing metal in forms and concreted in place, or by placing the reinforcing metal in forms and concreted on the ground and afterward assembled into place.

In the accompanying drawings Figure 1 is a fragmentary perspective view of a bridge disclosing the manner in which some of the parts are assembled. Fig. 2, is a transverse vertical sectional view of the bridge showing the section on the one end taken through one of the spans where the pocket is located, while the other side is taken on the span directly in front of one of the pockets. i

A, represents one of the girders or spans of the bridge which are preformed and placed upon suitable abutments B. These spans preferably consist of horizontal upper and lower beams 1--1 connected at their ends by verticalposts 2. These beams and posts 2 vare composed of reinforcing bars, angles or rods 3, which are bound together by means of bars or wires @-4 to withstand the stress to which they may be subjected.

Arranged at predetermined intervals between the ends of the span or posts are struts C, which are similarly reinforced by vertically arranged angle-irons and wires (not shown). Extending diagonally between the several struts C and'end posts 2 are diagonal struts 5, it being understood that the several reinforced elements are embedded in concrete, thus presenting a reinforced span as disclosed. These struts C are somewhat wider than the end portion of the span andV surface of this orifice is somewhat inclinedY inwardly as at 7 while the lower surface 8 is horizontally arranged. Adapted to be received within these oppositely disposed orifices 6 are preformed floor beams 9. These Specification of Letters Patent.

Patented Aug. 22, 1916.

seria1 No. 786,127.

beams are reinforced in the usual manner, and preferably have their outer ends beveled as at 10 on the upper side thereof in a direction opposite'to the upper beveled surface of the orifices 6 of the span in which they are received. Protruding from the beveled surfaces of the beam are the reinforcing bars 11, which are adapted to bend up into the orifices. It will be noted that the space left between the two beveled surfaces of the orifices 6 and the beam forms a substantially V-shaped pocket flaring outwardly toward the outer edge of the span, which when lled with concrete forms a wedge, which by its shape together by its bond with the previously cast concrete effectually prevents any possible separation of the different elements.

The floor slabs 12 are constructed of reinforcing rods and bars 13 and are provided with an opening 14k at their inner edges, the concrete being applied to the reinforcing rods and after the slabs are placed in position, they are connected together at the center of the floor by concrete 14 which is poured between the slabs, so that the slabs are securely fastened together. The adjoining ends of the slabs are similarly connected together. The outer edges of the slabs project over the inclined surfaces of the beam in such a manner that the lower edges of the slabs are partially embedded in the manner disclosed in Fig. 2, thereby completely uniting the spans, the beams and the floor slab at this point.

7e claim:

1. A concrete truss bridge comprising preformed reinforced concrete spans, which have orifices formed therethrough at intervals, preformed beams having their outer ends beveled and adapted to be received within said orices, the upper surfaces of which are beveled in a direction opposite to the beveled surfaf/e of the beams, mechanical means projecting outwardly from the beveled ends of the beams and adapted to be received within said orifices, and fillings molded into said orifices and embedding said metallic members, said filling practically forming a V-shaped wedge flaring outwardly from the inner edge of the girder.

outer en ds beveled land adapted to be re- In testimony whereof we aiiiig our signaceived within said orifices, the upper surfaces tures, 1n the presence of two witnesses.

of which are beveled in a direction opposite the beveled surfaces of the beams, mechanical means projecting outwardly from the u beveled portion of the beams and adapted Vitnesses to signature of John V. Jenkins:

ELLA GRUTsoH,

to be received within said orifices, floor slabs arranged upon said floor beams, said orices GEORGE H. GALLET.

subsequently filled in with concrete thereby Witnesses to signature of Edward J. embedding the mechanical means and assist- Creighton:

ing in securing the beams, girders and floor C. A. BRADLEY,

slab together. ELLA GRUTsoH.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

